<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<style>
    div{
        width: 180px;
        height: 300px;
        background: url(img/tiao.png) -180px 0;
        animation: a .5s steps(6,start) infinite;
    }
    @keyframes a{
        100%{
            background-position: -1280px; 
        }
    }
</style>
<body>
    <div></div>
</body>
</html>